Thanks to all... Now it's work...
>> You are attempting to modify a color at some random memory location, that's
>> never been allocated (you didn't initialize colore) and then you passed
>> this dodgy pointer to gimp_by_color_select. In most parts of the GIMP,
>> GimpRGB are statically allocated, and you see that they are used more like
gimp_rgb_set_uchar(&colore, pixel, pixel, pixel);
parametri = GIMP_CHANNEL_OP_REPLACE;
success = gimp_by_color_select(drawable->drawable_id,
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